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Research on Seismic Performance of Lap Connection Between Rectangular CFST Column and RC Beam(PDF)

《建筑科学与工程学报》[ISSN:1673-2049/CN:61-1442/TU]

Issue:
2021年03期
Page:
13-20
Research Field:
Publishing date:

Info

Title:
Research on Seismic Performance of Lap Connection Between Rectangular CFST Column and RC Beam
Author(s):
LIANG Shu-ting1;  YANG Jian1;  ZHU Xiao-jun2;  DANG Long-ji1
(1. School of Civil Engineering, Southeast University, Nanjing 210096, Jiangsu, China; 2. Architects & Engineers Co., Ltd of Southeast University, Nanjing 210096, Jiangsu, China)
Keywords:
beam-column joint;  CFST column;  RC beam;  low cyclic loading test;  seismic performance
PACS:
TU398.9
DOI:
10.19815/j.jace.2019.01043
Abstract:
A new type lap connection between concrete-filled steel tubular(CFST)column and reinforced concrete beam was proposed on the basis of current connection forms of CFST column and reinforced concrete(RC)beam. The failure mode, bearing capacity, stiffness degradation, ductility and energy dissipation capacity of the connection were studied by low cyclic loading test and numerical simulation analysis. The strain development law of longitudinal reinforcement at beam end and lap corbel flange was analyzed. The results show that the lap connection of CFST column and RC beam shows a typical failure mode of plastic hinge at the end of concrete beam, which accords with the seismic fortification concept of “strong connection and weak member”. The hysteretic curve of the connection is full, the pinch phenomenon is light, the stiffness degradation is obvious, the strength degradation is small, and the connection has good ductility and energy dissipation capacity. The cross section strain at the end of lap bracket is largest among measuring points of longitudinal reinforcement and corbel. The effective transfer of bending moment and shear force at beam end can be realized by lap connection, but the insufficient lap corbel length will lead to anchorage failure. In the design of connections, enough lap length should be ensured to realize the reliability of anchorage performance of longitudinal reinforcement of reinforced concrete beam under the condition of bending shear composite force and give full play to the seismic energy consumption capacity of the connections. The finite element results are in good agreement with the experimental data. The model can accurately reflect the mechanical characteristics of the connections under the actual stress. The research results can provide technical support for the engineering application of this new type of lap connections.

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Last Update: 2021-05-20